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DTC P0053: Ho2S Heater Resistance (Bank 1, Sensor 1)

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2010 Mercury Mountaineer, 2010 Mercury Milan, 2010 Mercury Mariner, 2010 Mercury Grand Marquis, and 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0053: HO2S HEATER RESISTANCE (BANK 1, SENSOR 1)

Description:  Heater current requirements too low or high in the heated oxygen sensor (HO2S) heater control circuit.
Possible Causes: 
  • VPWR circuit open
  • HO2S heater circuit open
  • HO2S heater circuit short in the harness
  • Damaged HO2S heater
Diagnostic Aids:  Inspect the connectors for signs of damage, water ingress, or corrosion.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Escape/Mariner 3.0L,
E-Series 4.6L,
E-Series 5.4L,
Expedition,
F-150,
Flex,
Fusion 3.0L,
Milan 3.0L,
MKS,
MKT,
Navigator,
Taurus		 GO to PINPOINT TEST DZ .
All others GO to PINPOINT TEST DW .
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